/*
 * Copyright (C) 2015 Karumi.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.karumi.dexter;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 * Class to execute tasks in a background thread with the ability to wait for all the tasks to
 * finish.
 */
public class AsyncExecutor {

  private static final int MAX_NUMBER_OF_WAITING_SECONDS = 5;

  private final ExecutorService executor = Executors.newSingleThreadExecutor();

  public void execute(Runnable runnable) {
    if (!executor.isShutdown()) {
      executor.execute(runnable);
    }
  }

  public void waitForExecution() throws InterruptedException {
    executor.shutdown();
    executor.awaitTermination(MAX_NUMBER_OF_WAITING_SECONDS, TimeUnit.SECONDS);
  }
}
